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4349 | Serge | 1 | /* |
2 | * Copyright (C) 2006 Aurelien Jacobs |
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3 | * |
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4 | * This file is part of FFmpeg. |
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5 | * |
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6 | * FFmpeg is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the GNU Lesser General Public |
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8 | * License as published by the Free Software Foundation; either |
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9 | * version 2.1 of the License, or (at your option) any later version. |
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10 | * |
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11 | * FFmpeg is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | * Lesser General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU Lesser General Public |
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17 | * License along with FFmpeg; if not, write to the Free Software |
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | */ |
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20 | |||
21 | /** |
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22 | * @file |
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23 | * VP5 and VP6 compatible video decoder (common features) |
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24 | */ |
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25 | |||
26 | #ifndef AVCODEC_VP56_H |
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27 | #define AVCODEC_VP56_H |
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28 | |||
29 | #include "dsputil.h" |
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30 | #include "get_bits.h" |
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31 | #include "hpeldsp.h" |
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32 | #include "bytestream.h" |
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33 | #include "h264chroma.h" |
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34 | #include "videodsp.h" |
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35 | #include "vp3dsp.h" |
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36 | #include "vp56dsp.h" |
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37 | |||
38 | typedef struct vp56_context VP56Context; |
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39 | |||
40 | typedef enum { |
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41 | VP56_FRAME_NONE =-1, |
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42 | VP56_FRAME_CURRENT = 0, |
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43 | VP56_FRAME_PREVIOUS = 1, |
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44 | VP56_FRAME_GOLDEN = 2, |
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45 | VP56_FRAME_GOLDEN2 = 3, |
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46 | } VP56Frame; |
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47 | |||
48 | typedef enum { |
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49 | VP56_MB_INTER_NOVEC_PF = 0, /**< Inter MB, no vector, from previous frame */ |
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50 | VP56_MB_INTRA = 1, /**< Intra MB */ |
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51 | VP56_MB_INTER_DELTA_PF = 2, /**< Inter MB, above/left vector + delta, from previous frame */ |
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52 | VP56_MB_INTER_V1_PF = 3, /**< Inter MB, first vector, from previous frame */ |
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53 | VP56_MB_INTER_V2_PF = 4, /**< Inter MB, second vector, from previous frame */ |
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54 | VP56_MB_INTER_NOVEC_GF = 5, /**< Inter MB, no vector, from golden frame */ |
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55 | VP56_MB_INTER_DELTA_GF = 6, /**< Inter MB, above/left vector + delta, from golden frame */ |
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56 | VP56_MB_INTER_4V = 7, /**< Inter MB, 4 vectors, from previous frame */ |
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57 | VP56_MB_INTER_V1_GF = 8, /**< Inter MB, first vector, from golden frame */ |
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58 | VP56_MB_INTER_V2_GF = 9, /**< Inter MB, second vector, from golden frame */ |
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59 | } VP56mb; |
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60 | |||
61 | typedef struct VP56Tree { |
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62 | int8_t val; |
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63 | int8_t prob_idx; |
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64 | } VP56Tree; |
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65 | |||
66 | typedef struct VP56mv { |
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67 | DECLARE_ALIGNED(4, int16_t, x); |
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68 | int16_t y; |
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69 | } VP56mv; |
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70 | |||
71 | #define VP56_SIZE_CHANGE 1 |
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72 | |||
73 | typedef void (*VP56ParseVectorAdjustment)(VP56Context *s, |
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74 | VP56mv *vect); |
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75 | typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src, |
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76 | int offset1, int offset2, int stride, |
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77 | VP56mv mv, int mask, int select, int luma); |
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78 | typedef void (*VP56ParseCoeff)(VP56Context *s); |
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79 | typedef void (*VP56DefaultModelsInit)(VP56Context *s); |
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80 | typedef void (*VP56ParseVectorModels)(VP56Context *s); |
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81 | typedef int (*VP56ParseCoeffModels)(VP56Context *s); |
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82 | typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf, |
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83 | int buf_size); |
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84 | |||
85 | typedef struct VP56RangeCoder { |
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86 | int high; |
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87 | int bits; /* stored negated (i.e. negative "bits" is a positive number of |
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88 | bits left) in order to eliminate a negate in cache refilling */ |
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89 | const uint8_t *buffer; |
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90 | const uint8_t *end; |
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91 | unsigned int code_word; |
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92 | } VP56RangeCoder; |
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93 | |||
94 | typedef struct VP56RefDc { |
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95 | uint8_t not_null_dc; |
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96 | VP56Frame ref_frame; |
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97 | int16_t dc_coeff; |
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98 | } VP56RefDc; |
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99 | |||
100 | typedef struct VP56Macroblock { |
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101 | uint8_t type; |
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102 | VP56mv mv; |
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103 | } VP56Macroblock; |
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104 | |||
105 | typedef struct VP56Model { |
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106 | uint8_t coeff_reorder[64]; /* used in vp6 only */ |
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107 | uint8_t coeff_index_to_pos[64]; /* used in vp6 only */ |
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108 | uint8_t vector_sig[2]; /* delta sign */ |
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109 | uint8_t vector_dct[2]; /* delta coding types */ |
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110 | uint8_t vector_pdi[2][2]; /* predefined delta init */ |
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111 | uint8_t vector_pdv[2][7]; /* predefined delta values */ |
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112 | uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */ |
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113 | uint8_t coeff_dccv[2][11]; /* DC coeff value */ |
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114 | uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */ |
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115 | uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */ |
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116 | uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */ |
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117 | uint8_t coeff_runv[2][14]; /* run value (vp6 only) */ |
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118 | uint8_t mb_type[3][10][10]; /* model for decoding MB type */ |
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119 | uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */ |
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120 | } VP56Model; |
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121 | |||
122 | struct vp56_context { |
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123 | AVCodecContext *avctx; |
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124 | H264ChromaContext h264chroma; |
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125 | HpelDSPContext hdsp; |
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126 | VideoDSPContext vdsp; |
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127 | VP3DSPContext vp3dsp; |
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128 | VP56DSPContext vp56dsp; |
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129 | uint8_t idct_scantable[64]; |
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130 | AVFrame *frames[4]; |
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131 | uint8_t *edge_emu_buffer_alloc; |
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132 | uint8_t *edge_emu_buffer; |
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133 | VP56RangeCoder c; |
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134 | VP56RangeCoder cc; |
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135 | VP56RangeCoder *ccp; |
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136 | int sub_version; |
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137 | |||
138 | /* frame info */ |
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139 | int golden_frame; |
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140 | int plane_width[4]; |
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141 | int plane_height[4]; |
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142 | int mb_width; /* number of horizontal MB */ |
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143 | int mb_height; /* number of vertical MB */ |
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144 | int block_offset[6]; |
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145 | |||
146 | int quantizer; |
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147 | uint16_t dequant_dc; |
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148 | uint16_t dequant_ac; |
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149 | |||
150 | /* DC predictors management */ |
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151 | VP56RefDc *above_blocks; |
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152 | VP56RefDc left_block[4]; |
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153 | int above_block_idx[6]; |
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154 | int16_t prev_dc[3][3]; /* [plan][ref_frame] */ |
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155 | |||
156 | /* blocks / macroblock */ |
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157 | VP56mb mb_type; |
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158 | VP56Macroblock *macroblocks; |
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159 | DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64]; |
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160 | |||
161 | /* motion vectors */ |
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162 | VP56mv mv[6]; /* vectors for each block in MB */ |
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163 | VP56mv vector_candidate[2]; |
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164 | int vector_candidate_pos; |
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165 | |||
166 | /* filtering hints */ |
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167 | int filter_header; /* used in vp6 only */ |
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168 | int deblock_filtering; |
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169 | int filter_selection; |
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170 | int filter_mode; |
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171 | int max_vector_length; |
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172 | int sample_variance_threshold; |
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173 | |||
174 | uint8_t coeff_ctx[4][64]; /* used in vp5 only */ |
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175 | uint8_t coeff_ctx_last[4]; /* used in vp5 only */ |
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176 | |||
177 | int has_alpha; |
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178 | |||
179 | /* upside-down flipping hints */ |
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180 | int flip; /* are we flipping ? */ |
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181 | int frbi; /* first row block index in MB */ |
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182 | int srbi; /* second row block index in MB */ |
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183 | int stride[4]; /* stride for each plan */ |
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184 | |||
185 | const uint8_t *vp56_coord_div; |
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186 | VP56ParseVectorAdjustment parse_vector_adjustment; |
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187 | VP56Filter filter; |
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188 | VP56ParseCoeff parse_coeff; |
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189 | VP56DefaultModelsInit default_models_init; |
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190 | VP56ParseVectorModels parse_vector_models; |
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191 | VP56ParseCoeffModels parse_coeff_models; |
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192 | VP56ParseHeader parse_header; |
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193 | |||
194 | /* for "slice" parallelism between YUV and A */ |
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195 | VP56Context *alpha_context; |
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196 | |||
197 | VP56Model *modelp; |
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198 | VP56Model model; |
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199 | |||
200 | /* huffman decoding */ |
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201 | int use_huffman; |
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202 | GetBitContext gb; |
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203 | VLC dccv_vlc[2]; |
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204 | VLC runv_vlc[2]; |
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205 | VLC ract_vlc[2][3][6]; |
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206 | unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */ |
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207 | }; |
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208 | |||
209 | |||
210 | int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha); |
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211 | int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s, |
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212 | int flip, int has_alpha); |
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213 | int ff_vp56_free(AVCodecContext *avctx); |
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214 | int ff_vp56_free_context(VP56Context *s); |
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215 | void ff_vp56_init_dequant(VP56Context *s, int quantizer); |
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216 | int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
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217 | AVPacket *avpkt); |
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218 | |||
219 | |||
220 | /** |
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221 | * vp56 specific range coder implementation |
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222 | */ |
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223 | |||
224 | extern const uint8_t ff_vp56_norm_shift[256]; |
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225 | void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size); |
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226 | |||
227 | static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c) |
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228 | { |
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229 | int shift = ff_vp56_norm_shift[c->high]; |
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230 | int bits = c->bits; |
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231 | unsigned int code_word = c->code_word; |
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232 | |||
233 | c->high <<= shift; |
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234 | code_word <<= shift; |
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235 | bits += shift; |
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236 | if(bits >= 0 && c->buffer < c->end) { |
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237 | code_word |= bytestream_get_be16(&c->buffer) << bits; |
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238 | bits -= 16; |
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239 | } |
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240 | c->bits = bits; |
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241 | return code_word; |
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242 | } |
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243 | |||
244 | #if ARCH_ARM |
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245 | #include "arm/vp56_arith.h" |
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246 | #elif ARCH_X86 |
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247 | #include "x86/vp56_arith.h" |
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248 | #endif |
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249 | |||
250 | #ifndef vp56_rac_get_prob |
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251 | #define vp56_rac_get_prob vp56_rac_get_prob |
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252 | static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob) |
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253 | { |
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254 | unsigned int code_word = vp56_rac_renorm(c); |
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255 | unsigned int low = 1 + (((c->high - 1) * prob) >> 8); |
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256 | unsigned int low_shift = low << 16; |
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257 | int bit = code_word >= low_shift; |
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258 | |||
259 | c->high = bit ? c->high - low : low; |
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260 | c->code_word = bit ? code_word - low_shift : code_word; |
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261 | |||
262 | return bit; |
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263 | } |
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264 | #endif |
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265 | |||
266 | #ifndef vp56_rac_get_prob_branchy |
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267 | // branchy variant, to be used where there's a branch based on the bit decoded |
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268 | static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob) |
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269 | { |
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270 | unsigned long code_word = vp56_rac_renorm(c); |
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271 | unsigned low = 1 + (((c->high - 1) * prob) >> 8); |
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272 | unsigned low_shift = low << 16; |
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273 | |||
274 | if (code_word >= low_shift) { |
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275 | c->high -= low; |
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276 | c->code_word = code_word - low_shift; |
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277 | return 1; |
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278 | } |
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279 | |||
280 | c->high = low; |
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281 | c->code_word = code_word; |
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282 | return 0; |
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283 | } |
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284 | #endif |
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285 | |||
286 | static av_always_inline int vp56_rac_get(VP56RangeCoder *c) |
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287 | { |
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288 | unsigned int code_word = vp56_rac_renorm(c); |
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289 | /* equiprobable */ |
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290 | int low = (c->high + 1) >> 1; |
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291 | unsigned int low_shift = low << 16; |
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292 | int bit = code_word >= low_shift; |
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293 | if (bit) { |
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294 | c->high -= low; |
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295 | code_word -= low_shift; |
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296 | } else { |
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297 | c->high = low; |
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298 | } |
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299 | |||
300 | c->code_word = code_word; |
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301 | return bit; |
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302 | } |
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303 | |||
304 | // rounding is different than vp56_rac_get, is vp56_rac_get wrong? |
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305 | static av_always_inline int vp8_rac_get(VP56RangeCoder *c) |
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306 | { |
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307 | return vp56_rac_get_prob(c, 128); |
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308 | } |
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309 | |||
310 | static av_unused int vp56_rac_gets(VP56RangeCoder *c, int bits) |
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311 | { |
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312 | int value = 0; |
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313 | |||
314 | while (bits--) { |
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315 | value = (value << 1) | vp56_rac_get(c); |
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316 | } |
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317 | |||
318 | return value; |
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319 | } |
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320 | |||
321 | static av_unused int vp8_rac_get_uint(VP56RangeCoder *c, int bits) |
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322 | { |
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323 | int value = 0; |
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324 | |||
325 | while (bits--) { |
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326 | value = (value << 1) | vp8_rac_get(c); |
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327 | } |
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328 | |||
329 | return value; |
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330 | } |
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331 | |||
332 | // fixme: add 1 bit to all the calls to this? |
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333 | static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits) |
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334 | { |
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335 | int v; |
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336 | |||
337 | if (!vp8_rac_get(c)) |
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338 | return 0; |
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339 | |||
340 | v = vp8_rac_get_uint(c, bits); |
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341 | |||
342 | if (vp8_rac_get(c)) |
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343 | v = -v; |
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344 | |||
345 | return v; |
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346 | } |
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347 | |||
348 | // P(7) |
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349 | static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits) |
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350 | { |
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351 | int v = vp56_rac_gets(c, 7) << 1; |
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352 | return v + !v; |
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353 | } |
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354 | |||
355 | static av_unused int vp8_rac_get_nn(VP56RangeCoder *c) |
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356 | { |
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357 | int v = vp8_rac_get_uint(c, 7) << 1; |
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358 | return v + !v; |
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359 | } |
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360 | |||
361 | static av_always_inline |
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362 | int vp56_rac_get_tree(VP56RangeCoder *c, |
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363 | const VP56Tree *tree, |
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364 | const uint8_t *probs) |
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365 | { |
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366 | while (tree->val > 0) { |
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367 | if (vp56_rac_get_prob(c, probs[tree->prob_idx])) |
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368 | tree += tree->val; |
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369 | else |
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370 | tree++; |
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371 | } |
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372 | return -tree->val; |
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373 | } |
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374 | |||
375 | // how probabilities are associated with decisions is different I think |
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376 | // well, the new scheme fits in the old but this way has one fewer branches per decision |
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377 | static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2], |
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378 | const uint8_t *probs) |
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379 | { |
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380 | int i = 0; |
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381 | |||
382 | do { |
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383 | i = tree[i][vp56_rac_get_prob(c, probs[i])]; |
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384 | } while (i > 0); |
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385 | |||
386 | return -i; |
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387 | } |
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388 | |||
389 | // DCTextra |
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390 | static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob) |
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391 | { |
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392 | int v = 0; |
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393 | |||
394 | do { |
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395 | v = (v<<1) + vp56_rac_get_prob(c, *prob++); |
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396 | } while (*prob); |
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397 | |||
398 | return v; |
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399 | } |
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400 | |||
401 | #endif /* AVCODEC_VP56_H */1)><1)>><>><>><>><>><>><>><>><>>=><=>=><=>>>>>>>>>>>> |